Double drum winch

ABSTRACT

A double drum winch having a hook drum and a boom drum is provided in which power from a power source is transmitted through high and low speed clutches, hook up and down moving clutches, boom up and down moving clutches, and hook brake, and boom brake to the respective drums. A high and low speed switching control valve controls the clutches, and at least two control valves are provided for operating the drums.

United States Patent Mita et al. July 22, 1975 [541 DOUBLE DRUM WINCH 2.529.299 11/1950 Tourneau 254/185 B 2 703161 1/1955 Kcim ct a1 192/4 R [75] inventors: Masazo Mlta; Masami Hashlmoto,

both of Osaka, Japan 1 f Primary ExaminerBen amin W. Wyche [73] ASsgnee: Kabushlk' Kalsha Komatsu Attorney, Agent. or Firm-Armstrong. Nikaido &

Seisakusho, Tokyo. Japan wegner [22} Filed: Mar. 14, 1974 1 1 pp 451.206 1571 ABSTRACT 0 A double drum winch having a hook drum and a [30] Forelgn Apphcat'on Pnonty Dam boom drum is provided in which power from a power June 13,1973 Japan 4865835 source is transmitted through high and low speed clutches. hook up and down moving clutches, boom [52] [1.8. CI. 192/4 R; 254/185 B up and down moving clutches, and hook brake and [51] Int. Cl B66d 1/26 b m brake to the respective drums. A high and low Field of Search 25 /185 B; 192/4 R, 18 A speed switching control valve controls the clutches.

and at least two control valves are provided for oper- [56] References Cited i th d UNITED STATES PATENTS 3 Cl 2 D F 2,445,116 7/1948 Huston 254/185 B PATENTEDJUL 2 2 ms XXXXXQ DOUBLE DRUM WINCH BACKGROUND OF THE INVENTION l. Field of the lnvention i This invention relates to a winch used mainly for the side crane of construction machinery. and-more particularly to a mechanical two-drum winch in which the respective drums are independently operated.

2. Brief Description of the' Prior Art 9 Since two drums cannot beindependeritly operated in a winch of this type known heretofore. an operation to elev'a'tionally move the hook by the other drum while elevationally moving the boom with the one drum cannot be dowri. Thus the working range is limited. Since the crane is so constructed as to operate many levers, skill is necessary for the operation; and further it causes operating error, or the driver tends to be fatigued rapidely.

SUMMARY OF THE INVENTION It is, therefore, an object of the present invention to provide a double-drum winch which independently operates the respective drums with fewer 'control levers.

It is another object of the present invention to provide a double-drum winch which may expand the working range by simplifying operation.

It is still another object of thepresent invention to provide a double-drum winch which may prevent erroneous operation.

DESCRIPTION OF THE DRAWINGS DESCRIPTION OF THE PREFERRED EMBODIMENT Reference is now made to the drawings, which show one embodiment of the double-drum winch of the present invention.

In the drawings, numeral 1 indicates a power source such as an internal combustion engine or prime mover carried on construction machinery (not shown), which is connected to clutch shafts 5 and 6 provided at right and left sides through universal joints 3 and 4, respectively provided at both sides of reduction gear 2. Low and high speed clutches 7 and 8 are provided at the clutch shafts 5 and 6, and the output gears 70 and 8a of the clutches 7 and 8, respectively are connected through gears 11a and 12a to a pair of clutch shafts 11 and 12, respectively connected by the universal joint provided at the intermediate portion. Hook down moving clutch l3 and boom down moving clutch 14 are provided laterally in space at right and left at the clutch shafts l1 and 12, respectively. Gears 11b and 12b are separately provided at the clutch shafts 11 and 12, respectively. which gears 11b and 12b are engaged with gears 15a and 16a, respectively provided at clutch shafts 15 and 16. Hook up moving clutch 17 and boom thereon for elevationally moving up and down the hook (notshown), while the other drum 26 is a boom drum and wire 28 is wound thereon for luffing the boom (not shown).

The hydraulic circuit for controlling the above winch is shown in FIG. 2. Source 29 of hydraulic pressure feeds hydraulic fluid or oil, through one branch to low and high speed clutches 7 and 8 through speed switching control valve 30 and throughanother branch to the hook and boom brakes 21 and 22, hook up and down moving clutches 13 and 17, and boom up and down moving clutches 14 and 18, respectively through the hook operating valve 31 and boom operating valve 32 respectively. All of the following operations can be operated by three levers such as operating lever 30a of the speed switching control valve 30, operating lever 31a of the hook operating valve 31, and operating lever 32a of the boom operating valve 32. The respective clutches and brakes are engaged and disengaged by hydraulic pressure and spring forces as shown in the following Table 1:

TABLE 1 axially therewith through intermediate gears 23 and 24; One drum25 is a hook drum, and wire 27 is wound Engagement Disengagement Hook: Brake Boom Brake Hook up moving clutch Hydraulic pressure Hydraulic pressure spring spring spring Hydraulic Pressure Hydraulic v pressure Hydraulic pressure Hydraulic pressure Hydraulic pressure Hydraulic pressure Hook down moving spring Boom moving clutch spring Boom down moving spring clutch Low speed clutch spring High speed clutch spring That is, the hook brake 21 and boom brake 22 are energized by the tension of the spring and are deenergized by the hydraulic pressure, and the other clutches are engaged by the hydraulic pressure and are disengaged by the tension of the spring.

The operation of thus constructed device will now be described, for example, when the boom is lifted and the hook is simultaneously lifted responsive to the content of the work, the hook upwardly moving clutch 17 and boom upwardly moving clutch 18 are engaged, and the other clutches and brakes are all disengaged, and the hook and boom operating valves 31 and 32 are operated. Thus, the rotary force from the source 1 of power rotates hook drum 25 and boom drum 26 simultaneously through reduction gear 2, one of high and low speed switching clutches 7 and 8, clutch shafts 11 and 12, hook and boom up moving clutches 17 and 18,

brake shafts l9 and 20, anti intermediategears 23 and 24. Thus the boom is elevated and the hook is also elevatedJ- Y On the contrary. when the boom and the hook are simultaneously moved downward. onlvthe hook down moving clutch l3=and boom down moving clutch 14 are engaged. And, when the hook is elevated while the boom is lowered; the hook up moving clutch l7 and the boom down moving clutch 14 are engaged and the other clutches and brakes are disengaged. The relation of these clutches and brakes responsive to the work is shown in the following Table 2. When the speed is varied, thespeed switching control valve 30 is operated so as to selectively engaged or disengage the high and low speed clutches 7 and 8.

TABLE 2 Relation of the clutches and brakes It should be seen from the foregoing description that in the present invention the two drums are independantly operated with the result that the luffing of the boom and up and down movement of the hook can be operated simultaneously and all the operations can be conducted with fewer operating levers and smaller operating force. Thus, there is less probability of opera tion error, and the operation is easy, and the fatigue of the driver is greatly reduced.

The present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The presently disclosed embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the in vention being indicated by the appended claims rather than the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

We claim:

1. A double-drum winch having a source of power,

comprising:

a. high and low speed clutches connected .to the source of power; V

b. hook up and down moving clutches connected to said high and low speed clutches for upwardly and downwardly moving the hook;

c. boom up and down moving clutches connected to saidhigh and low speed clutches for upwardly and downwardly moving the boom;

d. a hook brake connected to said book down moving clutch;

e. a boom brake connected to said boom down moving clutch;

f. a hook drum connected to the brake shaft of said hook brake; I

g. a boom drum connected to the brake shaft of said boom brake;

h. a hook operating valve for switching the hook up and down moving clutches and hook brake;

i. a boom operating valve for switching said boom up and down moving clutches and boom brake; and,

j. high and low speed switching control valve for switching said high and low speed clutches, whereby said boom and said hook may be independently operated.

2. A double-drum winch as set forth in claim '1,

wherein said hook and boom brakes are engaged by the tension of a spring means and disengaged by hydraulic pressure, and said clutches all are engaged by hydraulic pressure and disengaged by the tension of the spring means.

3. A double-drum winch as set forth in claim 1, wherein said hook drum and boom drum are coaxial 

1. A double-drum winch having a source of power, comprising: a. high and low speed clutches connected to the source of power; b. hook up and down moving clutches connected to said high and low speed clutches for upwardly and downwardly moving the hook; c. boom up and down moving clutches connected to said high and low speed clutches for upwardly and downwardly moving the boom; d. a hook brake connected to said hook down moving clutch; e. a boom brake connected to said boom down moving clutch; f. a hook drum connected to the brake shaft of said hook brake; g. a boom drum connected to the brake shaft of said boom brake; h. a hook operating valve for switching the hook up and down moving clutches and hook brake; i. a boom operating valve for switching said boom up and down moving clutches and boom brake; and, j. high and low speed switching control valve for switching said high and low speed clutches, whereby said boom and said hook may be independently operated.
 2. A double-drum winch as set forth in claim 1, wherein said hook and boom brakes are engaged by the tension of a spring means and disengaged by hydraulic pressure, and said clutches all are engaged by hydraulic pressure and disengaged by the tension of the spring means.
 3. A double-drum winch as set forth in claim 1, wherein said hook drum and boom drum are coaxial with each other. 